I notice that web browsers, like Firefox and Chrome, will cease functioning after applying Ubuntu security guide - level1_workstation in some Ubuntu 22.04.
Error is like as following:
snap-confine has elevated permissions and is not confined but should be. Refusing to continue to avoid permission escalation attacks. Please make sure that the snapd.apparmor service is enabled and started.
I am pretty sure that "snapd.apparmor service is enabled and started" after a quick check. With some Google research, i believe the issue is caused by a Linux Security Module called AppArmor, which restricts applications' capabilities and permissions with profiles that are set per-program. You can find more info about it here.
In short, AppArmor profiles have two modes of operation:
Complaining/Learning: profile violations are permitted and logged. This is useful for testing and developing new profiles.
Enforced/Confined: enforces profile policy in addition to logging the violation.
To solve the issue, we can set all profiles modes to "Enforced".
sudo aa-enforce /etc/apparmor.d/*
To verify profiles status, fire command "sudo aa-status"
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